Math of FF sensor size vs crop can someone help explain

Started Nov 25, 2012 | Discussions thread
ForumParentFirstPreviousNextNext unread
Flat view
Frugaltraveler
Regular MemberPosts: 290
Like?
Math of FF sensor size vs crop can someone help explain
Nov 25, 2012

Ok, been pondering about this for a while and question how is the crop factor of FF calculated?

FF is 24mm x 36mm = 864mm2

Crop Canon 22mm x 14.8mm = 329mm2

micor 4/3 or 4/3 17.3mm x 13mm = 225mm2

so given that how is the 1.6 crop factor calculated when the sensor is 2.63 times smaller?

and for 4/3 its even 3.84 times smaller?

How do you get a crop factor for the lenses of 2 if the sensor is a fourth of the size for the 4/3 system?

My assumption was always well 4/3 is "only" half the size of FF sensor? But NOT true.

So how does the saying go? "Assumption is the mother of all Fups"

Thanks for explaining.

-- hide signature --

traveling and photographing the hidden corners of the world
http://frugaltravelrus.com/
http://www.flickr.com/photos/frugaltravelrus

ForumParentFirstPreviousNextNext unread
Flat view
ForumParentFirstPreviousNextNext unread
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow